Spectral properties of plasmonic resonator antennas
2008; Optica Publishing Group; Volume: 16; Issue: 21 Linguagem: Inglês
10.1364/oe.16.016529
ISSN1094-4087
AutoresEdward S. Barnard, Justin S. White, Anu Chandran, Mark L. Brongersma,
Tópico(s)Metamaterials and Metasurfaces Applications
ResumoA theoretical study of the optical properties of metallic nano-strip antennas is presented. Such strips exhibit retardation-based resonances resulting from the constructive interference of counter propagating short-range surface plasmon-polaritons (SR-SPPs) that reflect from the antenna terminations. A Fabry-P erot model was formulated that successfully predicts both the peak position and spectral shape of their optical resonances. This model requires knowledge of the SR-SPP reflection amplitude and phase pickup upon reflection from the structure terminations. These quantities were first estimated using an intuitive Fresnel reflection model and then calculated exactly using full-field simulations based on the finite-difference frequency-domain (FDFD) method. With only three dimensionless scaling parameters, the Fabry-P erot model provides simple design rules for engineering resonant properties of such plasmonic resonator antennas.
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